Perforated multiple ply bag



April 15, 1952 J. w. MEAKER PERFORATED MULTIPLE PLY BAG 2 SHEETS-SHEET 1 Filed July 13, 1948 INVENTOR. v Jofin VIZ/Weak er A Tram/Em v lzlai April 1952 J. w. MEAKER 2,593,328

PERFORATED MULTIPLE PLY BAG Filed July 15, 1948 2 SHEETS-SHEET 2 JNVENTOR. Jo/m MK Meaker" ATTOfi/WEYJ Patented Apr. 15, 1952 ll UNITED STATES PATENT OFFICE 2,593,328 PERFORATED MULTIPLE PLY BAG John W. Meaker, New York, N .Y. Application July 1a, 1948, Serial No. 38,525

trically perforated to permit entrapped air to "escape therethrough as the bag is being filled. "It-will be understood that the term "paper as used herein refers to material of the character indicated as distinguished from woven materials. An object of the present invention is to provide for the more rapid escape of air through the plies that have been electrically perforated and form the body of a bag such as shown in my United States Patent No. 2,340,546, dated February 1, 1944. By increasing the rate at which entrapped air may pass through the body of a bag as the bag is being filled, the speed at which the bag is filled may be increased and thus, the production of the filling machines may be correspondingly increased.

Other objects and advantages of my invention will be apparent and best understood from the following description and the accompanying drawings in which:

Fig. 1 is a side view of a valved type of multiple ply bag embodying my invention;

Figs. 2 and 3 are section views on an enlarged Fig. 1;

Fig. 4 is a perspective view on a greatly enlarged scale of a portion of the bag shown in Fig. 1 and illustrating the arrangement of the plies therein;

Fi s. 5 and 6 are and views taken from the side and top, respectively, of Fig. 4;

Figs. '7 and 8 are end views taken from the side and top, respectively, of a modified form of a multiple ply bag structure embodying my invention;

Figs. 9 and 10 are end views taken from the side and top, respectively, of another form of multiple ply bag structure embodying my invention; and

Figs. 11 and 12 are end views taken from the side and top, respectively, of another form of multiple ply bag structure embodying my invention.

Referring to the drawings in detail. a multiple ply bag I of the valved type is shown in Fig. 1. This type of bag is shown for the purposes of illustrations only and it will be understood that the present invention may be utilized in other types of multiple ply bags as well. Bags of the valved type are well known and are commonly 4 Claims. (Cl. 229-55) scale taken along the lines 22 and 3-3 of used for packaging commodities such as cement or the like. The bag I is provided with a valved opening 2 at one corner thereof through which the bag may be filled from a suitable filling device and it has sewn end closures 3.

For the purposes of strengthening the bag and to obtain otherdesired properties such as water'- proofed outer surface, the body of the bag I is formed from a number of superimposed plies of paper. Each of the plies are in thefo'rm of a tube with its vertical edges overlapped and pasted together as indicated at 4, 5 and 6 in Figs. 1 and 2.

As shown and described in myUnited States Patent No. 23 10546 of February 1, 1944, each of the plies thatform the body of the bag I may be electrically perforated to provide minute, burrless perforations through which the air ontrapped in the bag during filling may escape, but which are small enough to prevent the commodity with which the bag is filled from passing through such perforations or water from entering such, perforations. As shown, for example, in my patent referred to above, the electrically perforated plies that have previously been used to form the bag body are smooth surfaced and under the pressure due to filling of the bag, there is a tendency for the contacting smooth surfaces 'of adjoining plies to be forced into such close contact that the flow of the air that is escaping 30 through the plies is restricted in passing from one ply to the next.

I have discovered that by interposing a. ply I of electrically perforated paper having crinkled surfaces such as a creped or ribbed paper between plies 8 and 9 of electrically perforated, smooth surfaced paper so as to provide passageways ill for the air passing between the plies that the rate at which the air entrappedin the bag may flow through the plies is greatly increased and thus, the rate at which the bag can be filled is also increased. The irregularities in the surface of the creped or ribbed paper forming the ply I form a multitude of small passageways as indicated at ID in Figs. 5 and 6 through which the escaping air may pass to an opening in the next ply. The movement of the air in this manner is indicated diagrammatically by the arrows in Fig. 6.

If desired, the paper forming the creped or ribbed ply I may be creped or ribbed. at practically no additional expense by subjecting the sheet of paper to the action of a creping or rlb-. bing roll immediately after electric perforation of the sheet. As is well known, the use of a creped or ribbed paper for the ply I also adds strength 3 and elasticity to the bag due to the ability of such paper to stretch considerably before rupturing. In electro-perforated bags of this type air entrapped in the bag during filling will escape but the material being placed in the bag does not; pass through such perforations.

In the embodiment of the invention illustrated in Figs. '7 and 8, five plies are shown with plies ll of creped or ribbed paper interposed between plies I2 of smooth surfaced paper. In the embodiment of the invention illustrated in Figs. 9 and 10, plies l3 of crinkled or ribbed paper are placed on either side of a ply M of smooth sur-, faced paper. And in the embodiment of the invention illustrated in Figs. 1'1 and 12 a single ply l5 of creped or ribbed paper is positioned next to a single ply [6 of smooth surfaced paper.

The illustrated embodiments of the invention; demonstrate the essential feature of placing :80 sheet or ply of perforated, creped or ribbed paper next to .asheet orgply of, perforated, smooth. surfacepaperto provide passageways through which the air passing through perforations in .one .of

.the plies may-move without being blocked in any way until it reaches a perforation in the adjacent ply. It will be understood that various changes .andmodifications maybe made in the illustrated embodiments of Y the invention without departing from theLscope of the invention as defined bythe .claiins appended hereto.

I claim: ;1.lIn amultiple ply bag, a bag body consist- :mg ;of aplurality of plies of paper, said-plies be- ;ing superimposed on each other and at least one of the plies of each pair of adjoining plies having tending through said plies with the perforations in one ply being connected with the perforations in the ,adjoiningply through the passageways formed by said surface irregularities.

2. In a' bag consisting of a plurality of plies .ofsheet material forming a body of 'the bag, the combination of a ,ply of sheet material having a plurality of perforations distributed throughout the surface area thereofand a ply of sheet material having a crinkled surface and a plurality ,gof fperforations distributed throughout the sur- V and'in the .crinkl'edsurface ply.

distributed throughout the surface area thereof,

said crinkled surface contacting with the smooth surface of the first-mentioned ply and forming passageways "between the plies communicating with perforationsin each of the plies.

4:111 'abag-consisting of a plurality of plies forming a body portion of the bag, the combination of a pair of plie of electrically perforatable sheet .material, each of said plies having substantial smooth opposing surfacesand a,-plur ality of electrical perforations distributed throughout the surface areas thereof, and a, ply eof .electrically perforatable sheet material havingcrinkled surfaces interposed between the smooth surfaces of the first-mentionedpa'ir of plies and a-plurality of electrical perforations distributed throughout the surface area thereof, said crinkled surfaces contacting with thesmooth surfaces of -the.firstmentioned plies and defining passageways com;- municating with perforations inthe pair of ,plies JOHN w.

REFERENCES CITED The following references "are of recordin the file of this patent:

UNITED STATES PATENTS Great Britain Feb. 11,1932 

